Belts and Holsters, holsters and belts, one could make a class just on that topic alone. Even in the military there are those who like the leather vs those who like the last chance. those who like angled vs straight vs thigh vs waist lvl. Those who like secondary on armor vs legs. And numerous styles for the current mission tasking.

Point being it would be time consuming in a class and also so subjective that it might be alittle better for a brief ppt. slide on examples and let the individuals learn over time. Heck...how many of us have changed over the years